Electrical rosette cut-out.



' No. 677,479. Patented July 2, [90L e. '8. warns. v

ELECTRICAL BOSETTE cur-our. Lgplimtion mm 32, won

(N0 Model.)

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UNITED STATES PATE T OFFICE.

- GEORGE E. TH AS, or HARTFORD, CONNE TICUT, ASSIGNOR TO THE,

PERKINS ELECTRIC SWITCH MANUFACTURING COMPANY, OF SAME PLACE.

ELECTRICAL ROSETTE CUT-OUT.

SPECIFICATION forming part of Letters Patent No. 677,479, dated July 2, 1901. 7 Application filed March 22, 1901. Serial No. 52,858- (No model.)

To all whom it may concern:

Be it known that I, GEORGE BJTHOMAs, a citizen of the 'United States of America, re siding in Hartford, in the county of Hartford, State of Connecticut, haveinvented an Improved Electrical Rosette Cut-Out, of which the following is a specification.

The bases and capsof rosette cut outs are now commonlymade of porcelain, and While porcelain is an excellent insulator and is mechanically strong for the purpose it has the drawback that as the securing means are generally constructed it is not always possible to get the cap to fit onto the base because of variations in the manufacture of the porcelain due to variations in the shrinkage of the molded partsin the vitrifying of the clay. To meet this difficulty and to insure that the inner face of the rim of the Cap shall always fit properly against the face of the base, I'provide the cap and base with interlocking contacts whose rear engaging-faces are in the same plane with the joint between the cap and base, and for this purpose I mount the interlocking fingers onthe base on a level with the rim Of the base, while the fingers on the cap are mounted upon the face of a shoulder flush with the rim of the cap.

In the accompanyingdrawings, Figure l is aview, half insection, of a rosette cut-out madein accordance with my invention. Fig. 2 is an inner face of the cap. I Fig. 3 is a perspective view of a part of the cap. Fig. 4 is a face View of the cleat form of the cut-out base, shown also in Fig. 1. Fig. 5 is a face view of the concealed form of cut-out base.

Fig. 6 is a sectional view on the line 6 6, Fig. 5. Fig. 7 is a face view of the molding style of cut-out base. u the line 8 8, Fig. 7; and Fig. 9 is a sectional View on the line 9 9, Fig. 2.

The same construction of cap can be used with the three styles of base-that is, the cleat, Figs. land 4:, the concealed, Figs.,5 and 6, and the molding, Figs. 7 and 8.

Referring to the cleat style of cut-out, Figs. 1 and 4, the base A has a central knob a, an annular rim a, and an intermediate annular groove a The two diametrically opposite contact-fingers B B rest upon shoulders C,

Fig. 8 is a sectional view on recessed out of the knob a, the face of this shoulder being on a level or flush with the face of the rim a of the base. The fingers B B are secured in place by screws 6, Fig. 1,

passing through openings from the back of the base. Thecontact-fingers B B bridge across the groove a and extend through notches in the rim to, andhave at their Outer ends any usual form of screw-clampD for the conductor-wire. The clamp 1), except as to its screw, may be formed in one with the finger B, the latter being bent, as shown in Fig. 1, to clear the rim of the cap, but the rear face of that part of the finger which bridges the groove a and with which the in.-'

fiush with the inner face of the time of the cap E, Figs. 3 and-9. I prefer to bend up the forwardly-projecting end of each finger F, as shown in Figs. 2 and 3, to facilitate its passing behind the corresponding fingerB on the base. I further prefer to split this end into two parts f f, one, f, relatively wide and inflexible and the other, f, relatively narrow and slightly flexible. The rigid part f gives the desired strength, while the flexible piece f may have its Outer end bent inward at y, so as to form a spring-catch to hook over the finger B of the base when the cap has been fitted to and turned on the base to engage the fingers F with the fingers B.

In the hollow of the cap are secured elec trical connecting-plates H H, to which the wires are connected, and between these plates H H and the fingers F F are fuses f grooves 9 being formed in the shoulders Gr forthe reception and protection of the fuses, Figs. 2, 3, and 9. The plates H H are secured to the cap by screws h, Fig. 9, passing through openings in the cap and threaded into the plates, and projecting ends of these same screwsalse serve to receive the screw-nuts h;

by which the. ends of. the fuses are secured. The screws 71?, by which the tap-wire ends 7 are secured to the plates H H, pass through the plates into openings at in the cap, Fig. 9,

p to prevent the plates Hfronn turningwith or media e a nular gr ove.

on h sc ew As I have said, this same construction of cap can be used on other styles of base. Thus in Figs. 5 and 6 I have shown the concealed:

form of rosette cut-out.- This'has a central knob a annular Trirn a and intermediate groove a and. theEcontact-fingers B. B' are linen ti es, w i e the u e ends e -the fing rs B' simply es aga nstt e fa of the time?- Ihthe me ding ty eef bas hewh n F g 7; and, 8 t ere are g oves M r he con ucters; bu in other respects he se s ub: stantially similar to th ase igs- 5 a d 6. There is. a entra knob at, a rim ani i e fi gers 13 1B are sec r d by cr o shoulders 0 in the knob and p -eject cross the annular sleeve, with their ente ends resting upon th face o the im e The faces of the shou ders G a'rein the same p an i h e ace of the rim or he basehe nner ends of he fingers lifi'earrying the bindi g-scr s s2. fer t e inewires; are for convenience bent down into the bottoms of their respective cross-grooves t t.

- I claim as my invention 1. A eut out' having a cap and base each having a ii d provided wi h inter o n contacts whose ar ngag g aces are i the 2. A cut-out having a base and an attachable cap, the latter having a rim and shoulders with contact fingers mounted on the shoulders flush with the face of said rim, substantially asdeser bed.

3. A cut-out having a base and a cap and engaging fingers carried by the two parts, the

base having a rim and having shoulders Whose faces carry the base-fingers and are in the same plane with said rim,substantially as described.

,7 .4 A cut-out having. a base and detachable cap, each provided with rims and with shoulders and fingers onthe shoulders to-interloc'k with the fingers on the other part, the shoulders'on the cap eing flush with ther m t he cap whil e the shoulders on'the base are flush with the rim of the base, snbstantiallyas de-, scribed. A. nt-Out ng a ase h vins'groeve and. contact-fingers bridging the grooves with a cap having contact-fingers to engage under the base-fingers, those onthe cap being each split into two parts, one narrow and flexible and the other part wide and rigid, as and for the purpose set forth. 7 1

6. A cut-out having contact fingers I and COUDGGfing-plates and shoulders on which the plates are mounted, the shoulders being notched for the reception and protection of the fuse-wires, substantially as described; .In testimonywhereof I'have signed my name to this specification in the. presence of two subscribing witnesses.

- GEORGJE) 13-. THOMAS.

Witnesses:

G. W. GOQDR'IDGE E- FQ j i same plane with the rim-joint between cap 40 and base, substantially as described; 7 

